Fulton Heating Solutions, Inc. -- PHW Manual -- 2010-0713
Page 48
depending on the particular system that all piping above the combination
shutoff/purge valve still contains air. If manual vents are installed on the
system high points, these should be opened to vent these locations.
When only water is discharged from all vents, the initial purging is
complete.
6. Open the combination shutoff/ purge valve (keep the vent closed). With
the gas shutoff valve closed, turn on power to the boiler and operate the
circulator. Circulate the system water for approximately 30 minutes to
move all air to the automatic air separation point.
7. Again, open manual air vents at high points of heating loop until a
constant stream of water is discharged from the vent. Close the vent and
make sure it’s watertight. Repeat procedure for all high points and for
every zone.
Warning
Never leave an opened manual air vent unattended. In the event an opened vent is
left unattended, water damage can occur.
8. Check temperature/pressure indicator reading, which should equal the
pressure reducing (fill) valve set pressure. No more water should be
entering the system. Close the shutoff valve on the cold water fill line.
9. Visually inspect all pipe joints and equipment connections for leaks. If
necessary, drain system, repair leaks and refill/purge the system. If no
pressure drop is detected for a period of two hours under pressure, the
system may be considered water tight.
10. When purging is completed, make sure the following are open—
combination shut-off/purge valve, shutoff valve to pressure reducing (fill
valve), shutoff valve in cold water fill line, and shutoff valve in return line.
Figure 15
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